ShipmoPC

ShipmoPC is a seakeeping
prediction code developed by Defense Research and Development Canada (DRDC)
which has been validated against model data for a wide variety of ships
including offshore supply vessels, FPSO's, coastal defense vessels and barges,
icebreakers and naval ships.

The code is based on
two-dimensional strip-theory and solves for frequency domain seakeeping
parameters (motions, accelerations, relative motion, shear force and bending
moments). Boundary element method or the Lewis forms (conformal mapping) method
is used in ShipmoPC to determine hydrodynamic properties of the ship hull.

As strip theory forms the basis
of ShipmoPC, common assumptions for this method are adopted. The fluid is
assumed to be incompressible, inviscid, and non-rotational. Most importantly, motion amplitudes and
velocities are assumed to be small.

ShipmoPC can be used to analyze mono-hull
ships of all sizes whose length to beam ratio is larger than 4 (to comply with
the strip theory assumptions). The code is also more accurate for moderate ship
speed (Fr< 0.35-0.4) and sea state up to sea state 6. Outside of these
ranges, results from ShipmoPC can still be used for comparison purposes or as
initial estimates. Moreover, it can be
used in fatigue analysis as load predictions are reliable in lower sea states.

Outputs from ShipmoPC are ship
motion and load predictions including the following:

Ship motions in six degrees of freedom in
regular and irregular seas(RAOs and RMS)